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The arterial supply of the nasal cavity is shared between three arteries which include:
the ophthalmic artery
the maxillary artery
the facial artery

The following branches correspond to this trio and include:
the anterior ethmoid artery
the posterior ethmoid artery
the sphenopalatine artery
the greater palatine artery
the superior labial artery

As far as venous drainage goes, an intricate cavernous plexus runs under the epithelium and drains into either the emissary vein, the sphenopalatine vein or one of the ethmoidal branches.

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